Fluid operated motor for sandpapering machines or the like



Nov. 17, 1936. LOB-Asso 2,061,082

FLUID OPERATED MOTOR FOR SANDPAPERING MACHINES OR THE LIKE OriginalFiled June 25, 1932 5 Sheets-Sheet l INVENTOR l//NCENT LOB/ 1530ATTORNEY NOV. 1936. v LOBASSO 2,061,082

FLUID OPERATED MOTOR FOR SANDPAPERING MACHINES OR THE LIKE OriginalFiled June 25, 1932 3 'sheets-sham' 2 INVENTOR l//NcE/VT 05955 oATTORNEY Y Y NOV. 17, 1936.4 v LOBASSQ 2,061,082

` FLUID OPERATED MOTOR FOR SANDPAPERING MACHINES 0R THE LIKE OriginalFiled June 25, 1932 5 Sheets-Shea?l 3 7\ f6 L 28 5.5 M9 59 56 i 57` `=517 y 25 i 26 26'- /f/ 23 d a U 25 INVENTOR 22 24 6.9 67 Q!! 23V/NceNT/.oesso BY 2f 54 68 l @www ATTORNEY In" T j Patented Nov. 17,1936 UNITED STATES FLUID OPERATED MOTOR FOR SANDPAPER- ING MACHINES ORTHE LIKE Vincent Lobasso, New York, N. Y.

Reled for abandoned application Serial No. 619,270, June 25, 1932. Thisapplication June 29, 1936, Serial No. 87,999

Claims. (Cl. 121-3)` a type'of motor suitable for operating sandpaperingmachines or the like.

The general object ofthe invention is to Vprovide an improved motor ofsimple, compact and v practical-construction, which, under the inuenceof fluid pressure, will operate at a high speed to drive a movablemember for a carriage upon which a piece of sandpaper may be mounted.

The above and other objects will appear more clearly from the followingdetailed description when taken in connection with the accompanyingVdrawings which` illustrate preferred embodiments of the inventive idea.

In the drawings:

Figure 1 isa perspective view of an apparatus embodying the presentinvention, illustrating the sameas a 'hand controlled type of machine.

Figure 2 is a top 'plan view partly broken away and shown in section.

Figure 3 is a fragmentary plan view partly broken away and with portionsof the mechanism shown in section.

Figure '4 is a similar view taken on a diierent horizontal plane fromFigure 3.

Figure 5 is a vertical longitudinal section on the line 5--5 of Figure 3and illustrating the manifold of the* motor in position.

Figure 6 is arbottom planview, partly broken away, of the motor casing.V

Fig-ure 7 is a transverse section through the apparatus.

Figures 8 and 9 are different perspectives of one of. the link elementsof the endless driving means constituting part of the motor.

` Figure 10 is a view similar to Figure j3 showing a slightly differentform of the invention. Figure 11 isa sectional view'through one .of thelink elements illustrated in Figure 10, and v Figure 12 `is an endelevation of a modied form of the apparatus.

The type of apparatus illustrated in Figures 1 to 9 `inclusive isintended for `hand control and especially adapted for small work. Asshown, the apparatus` comprises an elongated casing I5 having its endsrounded. Top and bottom plates `I6 and I1 respectively are secured tothe vertical wall of the casing and the latterplate is provided with anelongated opening I8. Mounted upon the top plate I6 `is a manifold orheader I9 to one end of which is suitably connected a flexible hose 20for supplying, from a suitable source, a fluid under pressure, such asair.

The casing 'l5 contains a .driving means operated, as will appear in thecourse of the description, by'the fluid enteringthe manifold .I9 toactuate a movable member such as the reciprocating carriage 2I suspendedbelow the casing and adapted to carry a sheet .of sandpaper 22. Themember 2| is provided with side flanges 23 (see Figure 7) extendingexteriorly of and opposed to longitudinal guide strips 24 secured to theunder side of the bottom plate I1 and between which flanges and stripsare interposed the ball bearings 25 employed to reduce to a minimum thefriction between the relatively movable parts as the carriageisreciprocated. AThe anges 23 also carry spring pressed clamps 26utilized to grip the edges of the sheet of sandpaper 22 thereby tosecurely hold the same in position during operation of the motor. To theends of the carriage 2| bumpers 21 may be secured thereto which mayengage the rounded end of the casing I5 as the carriage is reciprocated.To the opposed sides of the vertical wall of the casing I5 hand grips 28are secured which enable the operator to grip the motor in one hand andthereby assume directional control of the apparatus as it is beingoperated.

Within the `casing I5 there is mounted a supporting andlguidingstructure for the endless drivingmeans Vpreviously referred to and aboutwhich said means extend. This structure is preferably in the form of twocomplemental units which are relatively adjustable longitudinally of thecasing for the purpose of contr-olling the tension of said drivingmeansY and taking up any slack therein. The manner in which these unitsare adjustable will appear in the course of the description. Each of theunits comprises upper and lower spacedl blocks 29 and 30 respectivelydisposed between the top and bottom plates I6 and l1 and held incooperative relation by a screw-bolt 3|, the in* termediate portion ofwhich is surrounded by a spacing sleeve 32 interposed between the twosaid blocks, the bolt being threaded into,the upper plate ,I6 and .beingmanipulatedl through the opening I8 in the bottom plate I1. Adjacent theouter end of the blocks 29 and 3U of each unit and extendingtherethrough, is a stationary pintle 33 secured in position at its lowerend by means of asetscrew 34 and having threaded upon its upper end thelooknuts 35 which engage the top plates .I 6. 4Said upperend of thepintle extends into the manifold I9 and the pintle is provided with alongitudinal bore 36 for receiving fluid from said manifold. At thelower end of the bore 36 the pintle has a lateral port 31 through whichthe fluid in the bore escapes to accomplish the function of operatingthe driving means in a manner to later appear. The entrance of `thefluid under pressure into the bores 36 and the two pintles at oppositeends of the supporting structure is accomplished by a longitudinalpassage 38 formed in the manifold I9 and communicating at anintermediate point with .asmall ported chamber 39 which. in turncommunicates with a duct 49 extending to one end of the manifold whereit erator may depress said handle with a finger 'ori f the thumb whenthe apparatus isgrippedjforop-v eration and thereby open said valve.4.I"to.admit the air to the chamber 39 from whence it'passes in bothdirections to the bores 36 in 'the' pintles k33'.;v

Between the blocks 29 and 3i]v of each unitthe associated pintle 33 issurrounded by?, bearing7 sleeve 43 having a port 44 thereinwhichregisters with the port 31 in said pintle and rotatable about videdwith` ports, 46 in certainv faces thereof which are adapted to, beysuccessively vbr-ought into align,- ment or registration with theports31 and 44 as the guide member 45 'is rotatedby the previously mentionedendless driving means. v Said means is in the nature of a chainconsisting of a'plurality of linkV members i1 and 48alternately'arranged throughout the length of the chain and disposed injuxtaposition to each other, the adjace'ntvlink members beingoperatively joined by meansfof connecting elements 49 having enlargedspherical edges which engage in grooves 5I formed in the inner faces ofsaid link members. The inner faces of the members 41 and `48a`re alsoprovided with` Lipperl and lower,y transverse, channels 'or grooves 52(FgureyQ) inv whichr` are engageolrthe upper and lower series yofr'ollerbearings and54 carried respectively bythe upper and lower blocks2S and 3E), said ,series vof rollers extending the lengths of saidblocks so as to provide vantiirictio'n bearings for the endless elementsas the same is driven at a high speed in the manner Vto presentlyappear. Each of the link elements 41 is bored vertically throughout itsheight ,as indicated at 55 and in the upper and lower ends of saidboreare mounted the lubricating wicks l515,' and 51. with a spring 58interposed,therebetweento force said wicks upwardly and downwardly intoengagement with thel plates I6 and I1 respectively. These wicks aresaturated with a spitablerlubricant and their engagement with the plates'rlandvlltis designed to further reducel friction while the drivingmeans is being operated. :Eachfoftheglink elements48 is provided in itsouter face with a recess A59 which receivesy aA piston 60 extending theentire height of the element and slidable laterally in said recess,vthenoutwardv movementof the piston being lunder the influence ofthefluid pressure while the inward movement thereof is controlled by theengagement of its outer edge with the vertical wall of thecasing', I5.Thus as the endless driving means is moved in thefdirection of ,thearrow (Figure 4) and one of the elements 48 approaches one ofthe roundedends of the Acasing I5, said element engagesoneof the faces of theadjacent guide 45 having'fa port '.48 therein. lAfter this engagementa'i'urther sliding advancement of the element 48 Ybrings thesame totheposition shown in section inFigure 4,' at the same time rotating theguide 45.' and thereupon causes the port 46 to register with theportsand 44. The fluid under pressure now flows throughsaid vport 46 andintoa'duct 6I said element, said duct extending from the 'inner to theouter face thereof l At the same time the com pressed fluidi enters aybranch duct 62 leadingto the inner end ofthe recess 59. The rounded endofthe vertical wallof thecasing I5 hasjits inner surface eccentricallycurved as indicated aftSSvso that when the element 48 reachesthepos'i'tion just described the outer face thereof will be spaced fromsaid wall. The pressure of the fluid against the inner lend ofthe piston60 will therefore force the latter outwardly and maintain the same inengagement with said curved surface 63 and thereby form a chamber 64behind the piston. The fluid exhausting through the duct 6I enterssaidchamber 84 and impinges against the rear face of said piston andthus drives the element 48 inthe desired direction. Adjacent the otherend `of the eccentrically. curved surface 63 a vertical v v`wall -of thecasing I5 is provided with a series of fverti'calyfrowsof lateralexhaust ports 65 connected by vertical passages 86 which act to muillethe exhaust of the compressed fluid through the port `55 afterthelelement 48has passed the latter. Approaching the end of the curvedsurface 63 the piston 68 is forced inwardly .until the -outer surfaceofsaid element 48 againengages a straight portion of the wall of thecasing. The operation justdescribed is repeated at the other end of thecasing from whence it will be seen that on each cycle offthe endlessdriving means, each of the elementsl 48 'thereof will receive .twoimpulses and that consequently the driving means will be continuouslyoperated.

In korder to drive the movable member 2|, oneofthelink elementsof the`driving means is provided atits lower end with a depending pin 81(Figuresf and 7).. extending through the slot, I8 in the bottom plate I1and carrying at itslower enda vball bearing member 68. The member 68 isinterposed between two strips 69- carrledby the carriage Etand extendingtransversely thereof and,.,by.reason ofits contact with said strips, itwill be apparentthat the movement ofthe endless driving'meansthroughoutone cycle thereof will cause the carriage 2| to be reciprocated. As thelink element of the driving means which carries thev pin 61 makes theturns at opposite ends of the casing the bearing member 68 will .movetransversely of the carriage 2I and between the strips 69. if

Should it be found that there is an undue slack-A ness 'in the endlessdriving means which needs to be taken up in order to Secure maximumeiliciency, the units ofthe supporting structure previously referred toand which include the blocks 29 and 38, may be adjusted'away from eachother and longitudinally of the casing by means, best shown in Figure2whichcomprises a Setscrew 10 for each. unit mounted in the manifold I 9and having its 'tapered' inner vend engaged with a slide Il which inturn contacts the adjacent locknuts 35. An inward adjustmentof the screw10 forces the slide 1l towardone end of the casing and consequentlycauses the .unit with which it is associated to move in asimilardirection and thereby secure proper tensioning of the driving means.

In the form of the invention shown in Figures l0 and 11 each of the linkelements V12 compris'-` ingv the endless driving means is provided witha piston 13 s imilarv to the piston 6I)A and is further provided withyupper and lower lubricating wicks 14, each of which is controlled by anindividual spring 15 instead of by a common spring such as described inconnection with the rst embodiment. This kis done yfor the purpose ofproviding space for. theduct 16 in each of the elements through whichkthe iluid under pressure isfed to the inner edge and rear face of thepiston 13.

In Figure 12 a slightly different form of mounting fortheA carriage,which corresponds to the carriage 2| is provided. In this instance, saidcarriage is mounted for reciprocation between the strips 18 dependingfrom the plate I1 and is adapted to have attached to its under surface,by means of a setscrew 19, a block 80 of tapered formation to which asheet of sandpaper 8| may be attached by means of clamps 82, theformation of said block being such as to permit of access being gainedto surfaces to be sandpapered which could not otherwise be reached withthe flat construction shown in the embodiment originally described.

What is claimed is:

1. In a fluid operated motor for sandpapering machines, a casing, amovable carriage associated with said casing, a driving arrangement forsaid carriage within said casing and including a plurality of linkshaving ducts therein, pistons carried by said links, and means to supplyfluid pressure to said ducts to move said pistons to operative positionsand to propel the same.

2. In a fluid operated motor for sandpapering machines, a casing, amovable carriage associated with said casing, driving means for saidcarriage within said casing and including rotatable guide members, anendless element extending around said rotatable members and including aplurality of links, pistons carried thereby, and conduits for supplyinguid pressure through said guide members and links to actuate saidpistons to thereby operate said driving means.

3. In a fluid operated motor for sandpapering machines, a casing havinga bottom plate provided with an elongated opening, a manifold on top ofsaid casing, a supporting structure Within said casing and includingseparable units adjustable relative to each other, each unit consistingof superposed blocks, means accessible through the opening in said platefor securing together the blocks of each unit, an endless flexibledriving means extending around said supporting structure, means disposedwithin said manifold for adjusting said units relative to each other tovary the tension of said driving means, a reciprocatory carriagesupported beneath said bottom plate, a connection between said drivingmeans and carriage extending through the opening in said plate, andmeans to supply iiuid under pressure through said manifold to saiddriving means to operate the latter.

4. In a fluid operated motor for sandpapering machines, a casing havinga bottom plate provided with an elongated opening, an inlet on top ofsaid casing, a supporting structure within said casing and includingseparable units movable relative to each other, an endless flexibledriving means extending around said supporting structure, means disposedWithin said inlet for adjusting said units relative to each other tovary the tension of said driving means, a reciprocatory carriagesupported beneath said bototm plate, a connection between said drivingmeans and carriage extending through the opening in said plate, andmeans to supply fluid under pressure through said inlet to said drivingmeans to operate the latter.

5. In a fluid operated motor for sandpapering machines, a casing havinga bottom plate provided with an elongated opening, a reciprocatorycarriage supported beneath said bottom plate, a driving arrangement forsaid carriage Within said casing, and a fluid pressure inlet to supplyuid pressure to said driving arrangement, said driving arrangementincluding a plurality of links having ducts therein, pistons carried bysaid links and means to supply fluid pressure to said ducts to move saidpistons to operative positions and to propel the same.

6. In a fluid operated motor for sandpapering machines, a casing havinga bottom plate provided with an elongated opening, a reciprocatorycarriage supported beneath said bottom plate, a driving arrangement forsaid carriage within said casing, and a fluid pressure inlet to supplyfluid pressure to said driving arrangement, said driving arrangementincluding rotatable guide members, an endless driving means extendingaround said guide members and including a plurality of links, pistonscarried thereby, conduit means for the fluid pressure through saidguides and said links to operate the latter and thereby actuate saiddriving arrangement.

'7. In a fluid operated motor for sandpapering machines, a casing, asupporting structure within said casing including pintles each having aport therein, a guide revoluble about each pintle and controlling theopening and closing of the port therein, an endless driving meansextending around said guides, pistons carried by said driving means andcombining with said casing to form chambers, means to supply fluid underpressure through the ports in said pintles to said chambers to operatesaid driving means, and a movable member actuated by said driving means.

8. In a fluid operated motor for sandpapering machines, a casing, asupporting structure within said casing including pintles each having aport therein, a guide revoluble about each pintle and controlling theopening and closing of the port therein, an endless driving meansextending around said guides, pistons carried by said driving means andcombining with said casing to form chambers, a manifold on said casinghaving communication with said ports, means to supply fluid underpressure to said manifold and from thence through said ports to saidchambers to operate said driving means, and a movable member actuated bysaid driving means.

9. In a iluid operated motor for sandpapering machines, a casing, asupporting structure within said casing including pintles each having aport thereon, a guide revoluble about each pintle and controlling theopening and closing of the ports therein, an endless driving meansextending around said guides, pistons carried by said driving means andcombining with said casing to form chambers, a manifold on said casinghaving a main duct and branch passages leading to said ports, a valvecontrolling said main duct, means to supply fluid under pressure to saidduct and from thence past said valve to said chambers through said portsto operate said driving means, and a movable member actuated by saiddriving means.

l0. In a fluid operated motor for sandpapering machines, a casing, asupporting structure within said casing including relatively adjustableunits, each unit consisting of superposed supporting blocks, a pintlemounted in said blocks and having a port, a guide rotatable on saidpintle and controlling said port, an endless driving means extendingaround said guide and rotating the same, means to adjust the units ofsaid supporting structure relative to each other, means to supply fluidunder pressure through said port to said driving means to operate thelatter, and a movable member actuated by said driving means.

VINCENT LOBASSO.

